Reapply "[AArch64] Wrap integer SCALAR_TO_VECTOR nodes in bitcasts (#172837)" (#183380) (#184403)
This reverts commit b7ce37c6703f2d82376f50f82a05b807a0ad90ad.
The
[issue](https://github.com/llvm/llvm-project/pull/172837#issuecomment-3961532435)
this patch revealed was fixed by [this
patch](https://github.com/llvm/llvm-project/pull/183549).